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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9bd72d35c10487f6772c103c4ffda46f3919a863234a7ecf94bda66e7c3bc12' 
  AND token = 'D3p5RQ1F3GHk3s4thX51nmcmwpH1C/V49f0WLcE1gKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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