SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8edf7972efc569712c5956c04ad336c9d4513e7f2a2a65bd2087d81725744a2b' 
  AND token = 'jux3cQmKpnWeL/r/QJj/D4m4vCEgjRPX54z2qQC5Oq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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