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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ebec08eb06362f98502c529349926eab3ae0304761c50db56e50f9365d01fe' 
  AND token = 'x0586MsHwWS37Cunfffp8R/m3gy+VtvLv3XmDXY886w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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