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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc6d32473b98bcea9c6979884e71556545ad867639676df7ca35b9cbd41a841' 
  AND token = 'gd4wp6QhNxT9s6BIj5L77s2ALomQaJBGw5ROKSd40us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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