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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23814519ad474e914bd35633facdc22791be55c24550b0a8da3c663769114de' 
  AND token = 'bcCdX5ydIkwsvjE6vSLOOvm/1fWwaOR84de5H7fqepg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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