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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9303a82b6085d37996752ff873b981eee031774ac925f728adac884aa9fdd017' 
  AND token = 'Rgv+trtGoBdTDmrKDE9evkPs0WRnUC3N42txSwJf0J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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