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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19bb5b5e5700f74dec5a42e0af1bb611073941bd0766eb2f49d3e6bca4137e72' 
  AND token = 'YqGf8IMb2kBBNYpdBmSXYw90pHlvjiyzbF/2Vevk8Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00118

JSON explain

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