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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71410f80cf96be1b1d0ac882facef841b8f8578ad3a964cf77dbc4a710f8629' 
  AND token = 'e+O8mwgAtT3q7k3EwuokKriUmFgGNa/vc/pPMDTcTfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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