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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e57b3bd08e6bb2a48ed9300bb4d24863d3b9c99d42548da7276102ab972b2755' 
  AND token = 'yUegjWYqhafrEucbHUsVfuAt5cDmhr7wSXJGiz8576w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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