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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7f9c28ceb1442847aaaa423b0db35848ce5abd16468735e7004e6ed2a1f973' 
  AND token = 'LnUw8eJo9OVAE486/qjfcXx7mal3HH60DXjxmwx9P+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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