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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8be9b231fd5b84a7be0e887f2e802bd8dc1797f121ec7d5d4f6da0eeb8a4cdcd' 
  AND token = 'r3PJ37gPTwFpyG2cRiZxY5mX/wVVLzS7zIJkmqFpTbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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