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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d8724852e361fcd8e344e96391a2ba0c81704f3280d7abc9f41cc015301bda' 
  AND token = 'b4vHKi8RX5tMEClmvQFFzwQ1EhMWbGs9HUoCBTwbNs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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