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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696c2eeb69854cac3043609d7d1530052d4288a3e487a6f344eb98766a40d2ff' 
  AND token = 'DY4qR0yCgaheaVaK15MMhQhp5DGO1MWNnq0wsyqRTcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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