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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '446fa79f6bc19470802a84d456b468a420b4c48c586d1d433c27d232b749c373' 
  AND token = 'ODywteN9nA3KLoLEZ5ZfrpkDFqHXBkTlEnFP2B0XEuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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