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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5cae3bb077283471d0e6be9b599bc68fb2fc03618a2ee8eeaad068882a67b2' 
  AND token = 'DY+7x4GqhNFBA4a97o6pDwBTUPURwgg1aGmu/+XAn60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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