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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcdf1d3a9017a054b732194d54cf886618ba65a8b8586f8d001dae23ba88ccbe' 
  AND token = 'YN08kh49zcQKFKlazptVN3rN7/GnpRucHL7dT8qs4NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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