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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2614b240b0f3b759ddfbdd969c5504a63ddb2b8402e127df31d8bc80f8f02a4' 
  AND token = 'MSzXdMfw4tbR1612eW4ei5pEwGWQu72sy3TLhATkUUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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