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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e5a8bc3181ec124eb7f0b4100f055dce4fae45e3f12a140f0f01b2445ad552' 
  AND token = 'zh3D3U0PenoUCmiXSKfNnSz9+1I63YwebVIcfauWSSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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