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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a56e61b34ac84b83f67d436bf094e6f72654476df9a423ed8963e43dda4d10' 
  AND token = '4+j+aBiG+jfUfsQAknc2ZOS/neYBrrbbng2/VTk9A1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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