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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e41f3e33edb871a192bb3e3565fabed46683fa0ec3a3203ca27ac312874309' 
  AND token = '5TSZk1TcUWq+be6lH7GBFIXlbtLyqckugBqsSKixkEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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