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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f6b0c74835e21f1cd06d315824ba07bee387ad8c269daae0bcb795dcd4570c' 
  AND token = 'C5N+8fPqcf/eL8jeLLDRefoQjP0O+yQMRy0nNa85Udo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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