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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d62d365d9e2e26af67ac244f278f0f5dce729978593eb1f58234df82cadfdd9' 
  AND token = 'pq18aqPwI++lPgMMVoNuPg0yPnv6hGgrGA7fMidLr3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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