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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7a3f80a36249ed3d2b93eaa495b60cc7c6cf7c441ca1ce6d105c14313edba8' 
  AND token = 'MobC3t7skYa/ZuBpQpwFtmduSpRETEG8TCJoP0PL7fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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