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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5176615670e1f3680e9d7fb432b84bc7ee858d1b253db22b336423bbb9fbec0f' 
  AND token = 'HE04woeE03UCvWx2nexntt1N58ZmUQZG/doSB+Zo72s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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