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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a423b341d7341fce7e04b28d9d92580c9ae33b6ed478e96c9ccce9b029dd9e8' 
  AND token = 'otVVpKvG77X2U1wfkte5077mVvI166VA+xC1ikM8K5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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