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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d450ca704d0d23ffa2212cc6900f7b206cd1a0380e3782644e8ae761253a347' 
  AND token = 'T6ZaKl+GMi0wgSms4UREW62xhnqTVa3VmdXSE1EJ+jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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