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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd29c0a480d49fdbdd882cabb3179253f2152728bf6daa7107650233b8fa8207' 
  AND token = 'rkr3lpJiH9V9FvjkzRY0VURmueK945sR0mWlzda3TJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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