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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41892c22224dfdb947fea493f1164de7a7f7d0a97fcbdace0249c70bb69de71c' 
  AND token = '7uc6C0ApvNPPFiZi3FtrbM2kif0J/HOQ4w1SVn6hPPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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