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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd702150fa1cde5223575bdd37d6ee78fc736630504a288727d5a055a37c03411' 
  AND token = 'XHYep4g6XxVnKkSXoEp8bP2+s3d5eExipzk+bRrc7aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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