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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2462e9d726420f44405edabec0e3372fb7dc44260d236e681b2240d8c52b40' 
  AND token = 'xb3KbhSsfHvoSlI7lxGbdcHL6wiZikq0+Q81WWh1iO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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