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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089d26d01fb18462ef4a9fbf7b35011c89a8e0e853057c012d2e5b062fc9c449' 
  AND token = 'jLv2rJNic5J+zMwferWvNjPyY7zd5fVivxT4GB4uSgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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