SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95bda09457cc9f6dbd942dca03e33943e0b1ba266f9afe91381c524230d9994d' 
  AND token = 'BbuvpBzNzUOQ6JGLb9FzIhDkgnutoH/KCeN6AjFhZLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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