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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9a4896b8b8e7e330ec4b009a1399a31acd165832b38ae3e6276c69e36bab06' 
  AND token = 'mTr6PIV8RUp9XbM3liJh3j4rTv+aJLp42V//uHOLL+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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