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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c7a30f387fd38147026d19b39ed8982c883722dc04a2edc18ab59251f802cc' 
  AND token = 'ZpksgDPuE4zUa9Yt7rHH6YYwleKkH5k8fArpZb6vO8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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