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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd306459ba826f4212a5cb43f1654c40ae01e9900db1f59407a42d31dca51b0a' 
  AND token = 'bk5F0sutIipClWPwweay1bJGH6/n1PbOdt8UZzuK4gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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