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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30044f59f60ba1561516e304077d3d69c1d4b360be35befe876b79951e9f767f' 
  AND token = 'uSELgtv6bvDt7RqK9mq3AdF7O0YWEZirC01Vp8DNEwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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