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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a94751772f639a80f5b8dee683b5731443a4338e890f948cf1209492af967e1' 
  AND token = 'H938IHa6ar9hwuCil2omI/m06OZN+pCM9I8NtsIZJ+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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