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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56283194e7295fda272a7930f8da8483f0616c5a19a882a04976628f0706175' 
  AND token = 'Pssbw1wEfeBT1si5B4gh8HvbpNa9yi/6kf4UgpCS5CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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