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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8b4796dbe95e68f6c8c336e9a05d49025db3097ee5fec95cc66a7ee7db7f28' 
  AND token = 'vPms7J3axxx+D4+i259vKQ+Q13/rPjHZkltDS1ZJG+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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