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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c003834b8b5cc440925c4b9dd31bebf17769cddbd5520646be901c50f92df9' 
  AND token = '9PP5oTImhl65ODlby2QxoQsX7QdM6uvm1+325jPFxgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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