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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6cfccb0fe353e014aa9f54d409a68db239826c54d77104b4c0296db5b3fb918' 
  AND token = 'nty9LJdByagqN+437nL6R6HyrOg1bqKX3foDM3ICaTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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