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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0bfb6703448c8359f8c5f700ed4df279fa6de64c0fde61bd1d59dc02e1f6d6' 
  AND token = 'sFO43ROiC559dcF7plBo14urqcBZCOehJLZizFYxI7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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