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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa05dfde749457ca409dd8a7e6b7a63ef0a9dcac0eaadf7743a46c4d26fd624' 
  AND token = 'r0h6GfWPUJZQgh8UITeQ1pH4SgOxlhNBB4qW45Nwnww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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