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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e313fd4a4cbc914bc8ff0e3a35f71747ee0af6d5037ed63e819282ff2c79a15' 
  AND token = 'KrYb21mRP3raUYmIOwTuKOl3Z6rtyiuq5cZuDC4v/uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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