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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65607ff57223d1a4df44b6af5a42bc83487e3ecf82b372b77b3f07c4c7594c8' 
  AND token = 'J26qs5K2ldN6svyL2nniYUPOWPLZPDCBqNutYc1JXxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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