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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063601eef51103d1045359fc2872fcf0e452ea91506e9b30b02742893b2b9e86' 
  AND token = 'wptCJf8KzWRlqRzxWRTOCpLvZDmxlot9EW/fqb4+yec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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