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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d2e6b4f6da30acdfdbb41a84e91772cd1c38d2ea90037612eeb3938b338fa3' 
  AND token = 'WMjy7rcstCKShPOufUOMpv80EZe+vYej2ANTuA9HurE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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