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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db558ec8b9814a395f6bbcf57948840d0a8e16bbbaadce67f3ef18a8a98e07d5' 
  AND token = '/2AfyPVAdbxju9WPHMX6y974Mf16Y+d5N0cOIa9UriU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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