Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe88da51897d6d6fa3e32e6b110b0cc1a8ef51a2e9e0a248fae0e7c2ce3ec7a4' 
  AND token = 'MUJpU8sew7p6RRS8FO5s9Lgmc6Kd8A+PWTJIFQlu0oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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