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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177cbf974aa35b4e141eabfb0096f57af3c5c24d050e11e1fde96cf2d0d6e812' 
  AND token = '67VMArGXXVrSPyrjHBi8STrPjlmIYy0rpmw/avD9WZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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