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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6961338437a732cc228b208da5d40f91cb528047c3a565d04bdcd47d309fab' 
  AND token = 'aqR06wqTAfsy9LoCdP/dDMxR/oUnDIEXghCl6jWzZPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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