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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ccfe14e58930ed042c9b4c659310f1fca84c9e69a7062f4ac8ad65290b112e2' 
  AND token = 'xid6t70dqth1/oHcOPC8faoKiv3rcAfOOdDA+GZRbwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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