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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a0938e71f6a5638a9789981ede626040e69724bfcc07a542c46404bec6b20f3' 
  AND token = '/rri+KwWhev/v826IoBs0+qwFvRoX+9Ca7dwxG+XHLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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