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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ae1b5674f87fa1d1103871501ae4d8900265b1f702e38fd5193223d5ff7836' 
  AND token = 'WCjtF/K9Ni45Tg6UXsiufuN3lcJ0EooeLRga3qigKHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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