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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04490b4cf80ecc86411cb40fcb2e09f002364c76213dee6143d0192457b7e3fc' 
  AND token = 'N5HE/C7JyaPDM4HizsLPqi8AD/cQQhbTAHLlXCdo2Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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