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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b9d9699e87eb744f1f85546de9a4cad2958223334e8be23046639463011035' 
  AND token = '0ZQi+DWM7G1F6FdhsShZuku1zkWyumB9bp+uaps5Vro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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