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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1633ad2ede15fc9b66f52653855fde7a4d3fec721c5255a20782e0f7d2421c4' 
  AND token = '6kzAKjRKciTWIwhWIwGVFpO7jhg/ksc0O0w5NF25p7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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