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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff031367459252c03276ce3e1768165b2bad0d4455c61ba2d6f848fcef585770' 
  AND token = 'oEFe97vV6bfQYQJBQfWoX18P8K+SECKlrw9zcW7glVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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