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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072fbcb1e76424ba1ffcdb4cdaf46f2967485285e1f0964d6c966c0d315d34ee' 
  AND token = 'YNdUcQd1xUf5HnLODpIQSGBJ8JDE9Uf0hvlVQUMAFmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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