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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f12c8cf38a34693f25ea54103e1eb907bcb819d97443f1e8ae15bfe377baa30a' 
  AND token = 'tdCMWucK9fl4sCSKaRnYqsdWcZ14gkhBCpQiP2Wp4dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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