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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658d315487770105626388bb6fb512524043bb3e83405019a067cf35297d9951' 
  AND token = '8ngM0ff8/XO3t1k/s/6e9JBxy4PwrvLOa4KOrH4xPtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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