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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7f44ee90f85f31607f935a9049c148ff5a8d4e944dc0316defd8776c306779' 
  AND token = 'Yo45WjiVklf95BR2zCUUZZyzN8n3kVtCreOHUgbSKB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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