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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18249c8e7c3ffb0b3fc4217bf0fa9c408ef92f455a4609d2fd42ff6a0a5d73b9' 
  AND token = 'rj7OiB86JsVoEjR5qyuOgtl+hD0GNFOPMOVenr31lUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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