SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb854314508d6bf94f898ed30791204ed8f810a6359e4831b7b699f20d91f4d' 
  AND token = 'ARvw968J7uYxN/gZSoAUK0A5SDslJCSAqcvGTN3M+6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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