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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dfb8f5d9daea61c40c4ef0208894e271cb7ac1f9ac355a4bad41136cc3844ae' 
  AND token = 'gw7MorRiS5hz7AEuWFiIzQzPfot8cNz6y8gmwrDg6zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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