SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25695a94b2cff87a1216bb54e9f5ee539a011cf345258f398be5a042ddc13c97' 
  AND token = 'SYwiYaLWUlscqnVQsmgvaf3J/RkhBMzJyMfI5sld6jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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