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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6cb468b3b568965cc20839857048df0b898c81c05ea8afad3fdd39d7368e730' 
  AND token = 'YEdO5fSx9B3bRD7AD9QCK5JlLv2PHed3P7bMAoxePRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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