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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae44e2059bd632f563d22dd4669015c03dbe0db024b34879d61858d2c9b7ca68' 
  AND token = 'IT/4dWN971Xv2Yf7NK90KAh4d6AC/EbZF0ejK1mZVmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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