SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb378ef7df46a1c02887955a2029300519424178ada42d73d41ef3b1c5ef7057' 
  AND token = 'wRwm5H+uSbNqlFFEQY5WgbDDKeWcHsJ+ANFjZKbViQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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