SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f84f5d5f6f2a9e4bccf8a9f887acb158b3524c7353f310e9f27987749bdcff' 
  AND token = '7savCl58jh9SFNJlBQPOLdtvBjYU2+GX2U5lLHQCnJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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