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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a89e54a1312fb0a28f4df034de0cd486ef6349078b30de681246d92a194587f' 
  AND token = 'Tl/TDBiy95/Vo6McWhB4oknj5lwFVbQAg+oujTz46us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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