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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef8e207e79111aa250cf84076ac7cbc409af3471d2350db2b03b338b8dda64f' 
  AND token = 'ADxLhn6CR5R6U71hPpKJtnkDxs9AFOkrnOyXp9B1brM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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