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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c003f5a5c077f774705cce4917178638dc912a19168af31c298241b7332d42f' 
  AND token = 'wbXif0M68q4VlQon6u29vTZP1OH9v8jbAO9cupjhqXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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