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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5dd09ab18bd7438c7a9f2c267aa5141acf8c8ee72db5969aaa89959c6890801' 
  AND token = 'ghT+0P7RQhp5NAgvkFCxOuYND3yND15v+EWKIl9t840=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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