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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3fd64e7a92b5fe73db4f19fb5223b336d59e77a524f5dd4db15013576695a64' 
  AND token = 'rOWrau9LC0VWfT7Wm16ZpprhTGCkwXelXtIw5ZlvMG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.72012

JSON explain

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