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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9746f4dcea4685c5efe8dc7ccc8a476eab3921d038491bf88d03ea0af7cea515' 
  AND token = '2v39S5UTzv/r12vO0WBOtAP3/Tuf/Gyl6v7aPpbHvJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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