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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313da3fe6954e3405795231783ef9295a98fab1aab943a70e1a655254d628db1' 
  AND token = 'buy4A1OgJr96aiMK1Py53rSo2WiHArmVcgyqjK7H4v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}